Method of removing water from peat.



T| RIGBY.

METHOD 0F REMOVING WATER FROM FEAT.

APPucATmN FILED ocT.2;`/. 1913.

Ll Famed Ang; 331915,

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l N 'I ll www, W 1 1757# i To all whom t may concern:

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TIOMAS RIGBY, OF DUIVIFRIES, SCOTLAND, ASSIGNOR T0 WETCARBONIZING LIMITED, OF LONDON, ENGLAND.

METHOD OF REMOVING WATER FROM FEAT.

mareas,

Application i'led (Peto'ner 27, 193.

Be it known that I, THOMAS Riser, a subject ofthe King of Great Britain and Ireland, and residing at 61 Loreburn street,

Dumfries, Scotland, engineer, have invented' a certain new and useful Method of Removing l/Vater-from Peat, of which thefollowing is a specification.

It has long been known that under pressure peat will part more readily with a small proportion of its water when hot than when cold, and that proposals have been made to utilize this property by heating the pressing appliances.

As the result of experiment it has now been ascertained that peat which has been wet-earbonized according to the Ekenberg process, or has been by other kindred process of heat treatment caused to undergo those changes which make the'bulk of its water readily expressible, has still this property of losing water more easily and to a greater exltentV when pressed hot than when pressed eo d.

According to the present invention, methods of heat treatment of the kind in question are modified so as to take advantage of the hot treated tlls property, and this despite the necessity of recovering as far as possible the heat which has been supplied to the material. This is effected by regenerating the heat of peat in the usual manner, but in addition by interrupting the cooling before the temperature has fallen suihciently low to adect appreciably the ease of pressing, whereupon the peat is pressed and the heat regeneration then continued by using the hot effluent instead of the peat to impart heat to the cool raw material ment. The best temperature for pressing appears to vary considerably, but usually a temperature below 70o centigrade is to be avoided, while on the other hand a limit is placed on the use of higher-temperatures by.

Specification of Letters Patent.

awaiting treat- Patented Aug. 3ft, ill Seifal No. 797,636.

removal, where it continues heat.

in the accompanying diagrammatic drawto yield up its ing is shown a wet-earbonizing installation modified on these lines.

The peat pulp is forced into the apparatus at a, and passes through the inner tube, o, bend, e, inner tube, (l, bend c, inner tube, f, bend, g, outer tube, Iz, and then through the concentric tubes, i, and j, in the latter of which it is heated by the steam jacket, 7c, whereupon it passes through the pipe, Z, to the vessel, m, which is provided with stirrers, a, and intermediate baffles, o. On leaving the latter vessel by the pipe, p, the peat flows through the inner pipe, (1, bend, r, and outer pipe, .8, from the latter of which it leaves the apparatus by the pipe, t, connected to a storage reservoir, u, from which the peat is supplied through the pipe, o, to the filter press, 1v. From the latter the hot expressed liquid is returned by the pipe, to the regenerator part, y, of the wet-carbonizing apparatus having lost, if the various parts have been properly lagged and all ordinary precautions taken, but little heat. After imparting heat to the raw incoming peat passing through the tubes, Z1 and al, the peat now leaves the regenerator part, y, of the earbonizing apparatus at s.

Having now described my invention, what l claim as new and desire to secure by Letters Patent is ,z`

l. rlhe method of dewatering peat, consisting in passing tbepeat through concentric tubular passages, wherein it is heated under pressure, partially cooling the heated material by causing it to regeneratively heat raw peat in said passages, pressing the material while at a relatively high temperature, and thereupon returning the resulting effluent to said passages in order to continue the heat regeneration.

2. A method of de-watering peat by wetcarbonization consisting in heating wet peat tubular passages wherein it s heated under In testimony whereof I have signed my pressure, partlally eoohng the heated lnatename to thls speeloatlon 1n the presence of 10 r1a1 by causmg 1t to regeneratlvely heat raw two subscrlblng witnesses.

peat in said `passages, filter-pressing the TH MA- TnnY `\1 treated materlal at a temperature above 700 O b l I C. and thereu )on returnlno' the resultlno Wltnesses:

1: z: warm e'Huent to sald passages 1n order to JOHN Horn JOHNSTON.

continue the heat regeneration. 'ANDREW V. SKILLING. 

